<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<!-- 
		 application/json 媒体类型
		type="text/css"    text/html 
		 -->

		<link href="./css/common.css" rel="stylesheet" type="text/css" />
	</head>
	<body>

		<h1>学习CSS-2</h1>	

	</body>
</html>